Sewing-machine bobbin



Nov. 4, 1930. R. K. CLARK SEWING MACHINE BOBBIN Filed Jan. 12, 1929INVENTOR ATTORNEY5 Patented Nov. 4, 1930 'I'UNITEDI'STATES PATENT oFFIROBERT K. CLARK, OF SPRINGFIELD, MASSACHUSETTS, AssIeNoRTo THE AMERICANTHREAD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEYSEWING-MACHINE BOBBIN Application filed January 12, 1929. Serial No.332,119. v

within the friction device and preferably.

there is a friction device upon one end only of the bobbin. In thepreferred form the thread mass is wound upon a tubular-core,

I one end of which is crimped so as to secure one thread contacting diskand a superimposed friction member, while the other end is crimped so asto secure the contactlng disk at the other end of the bobbin.

The following is a description of an embodiment of my inventionreference belng had to the accompanying drawing, in which:

Figure 1 shows partly in section and part-' ly in side elevation abobbin embodying my invention in its preferred-form;

Fig. 2 is an upper plan view of the same. Referring more particularly tothe drawings, 2 is a cylindrical core of cardboard or other suitablematerial having wound there- 0 on a mass of thread 4 so as to form acop, the winding being of the well known universal type so as to beself-supporting. 6-6 are end pieces having central perforatlons throughwhich the ends of the core pass and inturned edges 88 which areyieldingly held against the peripheries of the ends of the mass 4. 10 isa centrally perforated friction disk, being a saucer-shaped memberpressed up from sized paper-or othersuitable material and givena-positive set, the same being resilient so as to tend to return to theshape shown in Fig. 1, when its periphery is moved toward the threadmass 4. This periphery 12 is circular and when the bobbin is Within theshuttle chamber. bears against one end of the chamber with a springpressure so as to produce a drag upon the bobbin preventing its throwingwhen the machine is in operation. The end 14 of the core passes throughthe lower disk 8 and is crimped over which the central portion of Thebobbin is so as to hold that disk in place, while the end 16 passesthrough'the upper disk 8 and themember 10 and is crimped so as to holdboth those two members in place. The upper disk 8 is provided with acentral depression into the member 10 extends. The plane of the edge 12is located a considerable distance beyond the crimped end 16 of the coreand for some distance from its periphery. it is spaced away from thethread mass 4 and the adjacent disk 8 so as to be unsupported. Theintermediate portion of the upper disk 8 contacts with the intermediateportion of the member 10 and assists in the return of the member 10 toits original position after the edge 12 has been pressed toward thethread mass 4.

As will be'evident to those skilled in the art my invention permitsVarious modifications without departing from the spirit thereof or thescope of the appended claims. What Iclaim is: I

l. A sewing machine bobbin comprising a core, a mass of thread woundthereon into copform, a resilient disk secured to one end of said coreand having its edge located in a plane beyond the end of said core, therear side of said disk being unsupported for a considerable distancefromits periphery.

2. A sewing machine bobbin comprising a core, a mass of thread woundthereon into cop form, a resilient disk secured to one end of said coreand having its edge located in a plane beyond the end of said core, therear side of said disk being unsupported for a considerable distancefrom its periphery, said disk being normally saucer-shaped.

3. A sewing machine bobbin comprising a core, a mass of thread woundthereon into cop form, a resilient disk secured to one end of said coreand having its edge located in a plane beyond the endof said core, therear side of said disk being unsupported for a considerable distancefrom its eriphery, and two disks having inturned edges engaging the endsof said thread mass, one of said en'- gaging disks lying between saidresilient disk and said mass.

' 4. A sewing machine bobbin comprising a core, a mass 0 thread woundthereon into cop- January, 1929.

form, a resilient disk secured to one end of said core and havin itsedge located in a plane beyond the end of said core, the rear side ofsaid disk being unsupported for-a considerable distance from itsperiphery, and two disks having inturned edges engaging the ends of saidthread mass, one of said engaging disks lying between said resilientdisk and said mass, and having a reentrant central portion into whichsaid resilient disk extends.

5. A sewing machine bobbin comprising a core, a mass of thread Woundthereon into cop form, a resilient disk secured to one end of said coreand having its edge located in a plane beyond the end of said core, therear side of said disk being unsupported for a considerable distancefrom its periphery, and two disks having inturned edges engaging theends of said thread mass, one of said engaging disks lying between saidresilient disk and said mass, the ends of said core being crimped so asto hold said three disks.

6. A sewing machine bobbin comprising a core, a mass of thread woundthereon lnto cop 'form, disks engaging the ends of the thread mass andheld against the thread mass by crimping of the outer ends of the core,said core and disk'being made of paper, and a saucer-shaped disk securedbetween one of the first mentioned disks and the adjacent crimpled endof the core, said saucer-shaped disk being made of paper of therequisite resiliency so that when the bobbin is in operation in theshuttle it produces afriction or drag to prevent the bobbin fromoverrunning.

In testimony whereof, I have signed my name to this specification this3rd day of ROBERT K. CLARK.

